The former South Carolina governor has a one-point edge on the eve of Tuesday's House election, says Public Policy Polling.

Rubio, with eyes on a 2016 presidential bid, needs issues in addition to immigration reform, experts say.

Sens. Ted Cruz, Rand Paul and Marco Rubio have been quietly jostling for position over policy and stature within GOP.

Gabriel Gomez, the Republican Senate candidate from Massachusetts, on Saturday demanded Rep. Ed Markey (D-Mass.) take down a web video that features the Republican candidate briefly sharing the screen with terrorist leader Osama bin Laden.

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The nation's largest Tea Party political action committee said Saturday that it would endorse former South Carolina Gov. Mark Sanford (R) in his special election bid against Democrat Elizabeth Colbert Busch.

"The decision in this race is simple: do the people of the First Congressional District want to elect another rubber stamp for Nancy Pelosi and Barack Obama, or do they want to send a proven conservative to Washington who will get the job done?" Tea Party Express Chairman Amy Kremer said in a statement. "We need leaders like Governor Mark Sanford in office if we are ever going to grow our economy and end the reckless spending and debt that plagues Washington."

Voters head to the polls Tuesday to decide between Sanford, who used to hold the 1st District seat, and Elizabeth Colbert Busch, the sister of comedian Stephen Colbert. Sanford was the early favorite in the race, but the House Republican campaign committee pulled support after new allegations surfaced that Sanford had violated his divorce agreement.

The appearances could be an early preview of the 2016 race for the White House.

Rep. Ed Markey (D-Mass.) holds a single-digit lead over Republican Senate candidate Gabriel Gomez.

A poll showed Gov. Sean Parnell (R) in a dead heat with first-term Sen. Mark Begich (D-Alaska).

Kentucky's secretary of state, Democrat Alison Lundergan Grimes, has yet to say if she'll challenge Mitch McConnell for U.S. Senate.