Keep up to date with the latest dispatches from these races.
New York Primaries -- 4:15 p.m. ET
The state's transition from pull-lever voting to an electronic optical scan system has not gone over smoothly.
Politico's Maggie Haberman reports that "Mayor Bloomberg called the widespread reports of voting-machine problems 'a royal screw-up and (it's) completely unacceptable.'"
And, according to the New York Daily News, Sen. Chuck Schumer (D-N.Y.) threw a minor tantrum when he was stricken by voting machine difficulties while trying to cast a ballot early this morning.
Washington, D.C. Mayoral Primary -- 3:10 p.m. ET
Problems with electronic voting scanners have been reported at multiple polling stations around Washington D.C. Mayoral Candidate Vincent Gray's camp reportedly may petition for voting hours to be extended as a result.
Delaware Republican Senate Primary -- 11:15 a.m. ET
Delaware Republican Senate candidate Christine O'Donnell was the target of a vicious robo-call Tuesday morning -- from her own former campaign manager.
Kristin Murray, who ran O'Donnell's third and most recent campaign -- a loss to then-Senator Joe Biden in 2008 -- recorded a message saying the tea party darling wasn't "concerned about conservative causes," and "just wanted to make a buck." Murray also alleged that O'Donnell "was living off campaign donations" by using them for personal uses like rent and debt. The call was funded by the Delaware GOP.
Watch the Delaware GOP's anti- O'Donnell robocall:
Delaware Republican Senate Primary -- 10:15 a.m. ET
Senate Minority Leader Mitch McConnell spoke with MSNBC this morning and clarified that he'd support the winner of the contentious Delaware race, even if the victor ends up being Tea Party-backed Christine O'Donnell.
"I'm going to support the Republican nominee for the Senate anywhere in America," McConnell said.