Mark Critz (D), a former aide to Rep. John Murtha (D-Pa.), won the race to replace his late boss.

Sen. Arlen Specter lost the Democratic nomination to Rep. Joe Sestak (D-Pa.) after switching parties last year.

Kentucky Attorney General Jack Conway (D) won by a thin margin and will face Rand Paul (R) in November.

Former Pennsylvania Rep. Pat Toomey cruised to the GOP Senate nomination after facing only token opposition from Johnstown activist Peg Luksik in the primary.

Toomey had 79 percent of the vote with 1,840 of 9,233 precincts reporting, according to unofficial returns. The Associated Press declared him the winner. 

He will face either Sen. Arlen Specter (D) or Rep. Joe Sestak (D) in the general election. In recent weeks, the Toomey campaign started directing its fire toward the congressman, attempting to brand him as a liberal extremist. Toomey has a considerable war chest and is expected to be a formidable opponent for either Sestak or Specter.

Tea Party favorite beats Senate candidate endorsed by Senate Minority Leader Mitch McConnell (R-Ky.)

The Nevada State Democratic Party filed a complaint with the Federal Election Commission Tuesday against Republican Senate candidate Sue Lowden for accepting an RV as an in-kind donation.

The Lowden camp said it's leasing the 2001 Monaco Executive Motorhome from supporter Carl Giudici, but the Democrats say the arrangement violates election law.

"The 'lease' with Mr. Giudici is irrelevant and, frankly, pointless," Bradley Schrager, an attorney for the Nevada Democrats, said in a statement. "She is 'leasing' a vehicle she already owns. The lease language does not in any way affect Nevada's determination of who owns this vehicle — Sue Lowden."

The Lowden camp said there's nothing wrong with the arrangement for its use of the "nearly decade-old RV."

"The Sue Lowden for U.S. Senate campaign has rightfully entered into a private lease agreement, with a private owner of this RV, to compensate the owner for the fair market value for the RV's use," Robert Uithoven, Lowden's campaign manager, said in a statement. "The payments and in-kind contributions have been fully and properly disclosed to the FEC. In addition, the lease agreement clearly states that Sue Lowden and the Sue Lowden for U.S. Senate campaign is not, has never been nor ever will be the owner of this private individual's RV.

"The campaign will continue to provide full compensation for the operation, use, maintenance, fuel and insurance on this RV, and we will continue to report such expenses as required by law."

The campaign provided a copy of the lease agreement to the Ballot Box but it did not specify how much it's paying for the vehicle's use.

Candidates are competing in a conservative-leaning district to face Idaho Rep. Walt Minnick, the only Democrat endorsed by the Tea Party.

Rep. Joe Sestak (D-Pa.) sought to portray himself as the real Democrat in the Senate primary against Sen. Arlen Specter (D-Pa.).

During the course of the campaign, he pointed to Specter's past in the GOP and played up in a TV ad the praise the former Republican received from George W. Bush. But is Sestak a team player? And do you need to be a team player to be a good Democrat? The Philadelphia Inquirer thinks so.

In reiterating its endorsement of Specter, the Inquirer's editorial board made this point:

_{Sestak has taken the rash step of giving up his 7th District congressional seat after only two terms to take advantage of Specter's vulnerability. Sestak accuses Specter of putting personal interests first. But Sestak's decision to give up his seat makes it likely that a Republican, former U.S. Attorney Pat Meehan, will win it.}

_{That certainly won't be good for President Obama's agenda.}

Flanked by veterans at an afternoon press conference, Connecticut Senate candidate Richard Blumenthal (D) said he regretted mischaracterizing his military service during the Vietnam War.

"I regret that I misspoke and I take full responsibility," Blumenthal said. "But I am going to continue to fight for veterans because they have been disrespected and dishonored when they served in Vietnam and then returned to this country."

On several occasions, Blumenthal said he served in Vietnam during the war when in fact he was stationed stateside during the conflict, according to the New York Times.

"I am proud of my service in the United States Marine Corps," he said. "I always honor those who gave far more than I did."

Blumenthal said it was only a "few" occasions that he misspoke about his service.

He said he would not allow his record to be tarnished by the mistakes. "I will not allow anyone to take a few misplaced words and impugn my record of service to our country," he said.

His words were cheered several times by veterans who gathered to hear the speech.

Blumenthal also pushed back against the Times story. "The article denigrates service in the Reserves," he said.

He noted he couldn't be held responsible for the published reports about his service in Vietnam. "I can’t be responsible for all the articles, I may not even have seen them," he said.

Democrats rallied around Blumenthal Monday. He's expected to be the party's nominee in the race to succeed retiring Sen. Chris Dodd (D-Conn.).