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The White House and Democrats are urging their supporters to go to the polls on an Election Day with the Senate majority hanging in the balance.

With Republican confidence growing, Vice President Biden and Senate Majority Leader Harry ReidHarry Mason ReidFeinstein departure from top post sets stage for Judiciary fight Whitehouse says Democratic caucus will decide future of Judiciary Committee Bottom line MORE (D-Nev.) worked to increase Democratic turnout as part of a ground operation the party hopes will save its majority in the Senate.

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“Did you vote?” Reid reminded his Twitter followers shortly after polls opened in Nevada early Tuesday morning.

Voter unhappiness with President Obama has been a drag on Democratic candidates across the country in the House and Senate, raising the chances that the GOP will gain the six seats it needs to win control of the Senate.

It also has led to a dire mood for House Democrats, who are expected to lose seats on Tuesday and, in some cases, are already sounding as if they are making their post-game commentaries.

Rep. James Clyburn (S.C.), the third-ranking House Democrat, acknowledged Monday that Republicans “have successfully made this campaign a referendum on President Obama.”

Obama was scheduled to spend the day at the White House, where he is meeting with advisers to discuss the Ebola epidemic. In a change to the schedule, the White House announced photographers would be allowed in for a portion of the meeting, ensuring the president would not be behind closed doors all day.

White House press secretary Josh Earnest dismissed questions about the president's relatively quiet schedule, saying Obama was “focused today on a couple of core American priorities,” including preparing for his upcoming trip to Asia.

Other Democrats were encouraging voters to head to the polls, while expressing confidence their party would prevail.

Biden is conducting a series of interviews designed to raise turnout in states such as Pennsylvania and Connecticut, where Democrats hope to win back one governorship and hold on to another.

The vice president predicted his party would hold the Senate majority and end up with 52 seats.

“I think we win Alaska, which you know the pundits are saying we lose. I think we win North Carolina, which is a tough race. I think we win New Hampshire, in fact I'm pretty, pretty confident we win New Hampshire,” Biden said.

Democrats are favored to hold seats in North Carolina and New Hampshire but are seen as underdogs in Alaska, where Sen. Mark Begich (D) is counting on a strong ground game to save him.

Three other seats now held by Democrats in South Dakota, West Virginia and Montana are assumed to be GOP takeovers.

Republicans also believe they will win Arkansas, and their candidates have led in polls in Colorado and Iowa. All three seats are now held by Democrats.

Sen. Mary LandrieuMary Loretta LandrieuCassidy wins reelection in Louisiana Bottom line A decade of making a difference: Senate Caucus on Foster Youth MORE (D-La.) faces a tough race in Louisiana, though she is likely to survive in Tuesday’s multi-party election, where a winner would need to get 50 percent of the vote to avoid a runoff in December.

In the runoff, Landrieu is seen as an underdog to Rep. Bill Cassidy (R-La.), who is expected to advance to that contest.

Democrats are hoping Michelle Nunn can defeat Republican David Perdue in Georgia to take back a GOP seat.

“I think Nunn is going to win in Georgia,” Biden said in a Tuesday interview with WPLR radio in Connecticut.

They are also hopeful that independent candidate Greg Orman will defeat GOP Sen. Pat Roberts in Kansas.

Turnout for the midterm elections is widely expected to be low because of voter unhappiness with both parties and the president.

That would favor Republicans, who are already expected to benefit from a whiter, older and smaller electorate than what would be seen in a presidential year.

Democrats at got a gift in the temperate weather expected in battleground states, such as North Carolina, New Hampshire, Georgia and Kansas.

Rain is set to fall from Texas and Oklahoma to Illinois and Michigan, according to data from the National Weather Service.

This is the first national election to take place since the Supreme Court ruled a core provision of the Voting Rights Act was unconstitutional, and Attorney General Eric Holder has dispatched election monitors to 18 states to collect data on voter discrimination.

Already on Tuesday morning, there were some reports of voting irregularities at polling places around the country.

In Kentucky, where Senate Minority Leader Mitch McConnell is expected to fend off a challenge by Democrat Alison Lundergan Grimes, a secretary of State spokeswoman told The Associated Press that a few reported voting machine and polling place issues had been resolved.

MSNBC reported that voting machines in one African-American-heavy precinct in North Carolina, voter rolls weren't delivered to a polling place. In another, thumb drives needed for the machines hadn't arrived.

The office of Rep. Scott Rigell (R-Va.) said they had received reports that supporters had tried to vote for Rigell, but the machine had switched their vote to his opponent. The local board of elections told Rigell's campaign that an individual's long fingernails could sometimes affect the way the machine's touch screen registered their vote.

Delays were also reported in Connecticut, and Democratic Gov. Dan Malloy had requested that polls stay open later to compensate for the lost time.

Poll watchers will also be looking for the effects of the harsh voter ID laws that have been implemented by state legislatures in recent years.