ABC's Z. Byron Wolf reports:
Christine O'Donnell's remarkable victory in the Republican Senate primary in Delaware will lead headlines after Tuesday's primaries. But there are other races worth paying attention to:
Sarah Palin's endorsement helped O'Donnell topple a moderate Republican, but it didn't do much for Maryland Republican Brian Murphy, who was walloped by former Governor Bob Ehrlich in the Gubernatorial primary there. Ehrlich got more than 75 percent of the vote. He'll square off against Gov. Martin O'Malley in November as he tries to get his old job back.
In Wisconsin, County Executive Scott Walker defeated wealthy businessman and former Rep. Mark Neumann. Walker, who had backing of the state party, will square off against Milwaukee Mayor Tom Barrett. Current Governor Jim Doyle, a Democrat, is not seeking a third term.
Also in Wisconsin is one of the most watched House races in the country. Sean Duffy is a former professional competitive lumberjack and reality TV star, who appeared on MTV's "Real World" in the 1990s. Now Duffy is a conservative Republican. He was running effectively against long-time Congressman David Obey when Obey decided not to seek reelection. Instead, Duffy will face off in November against Julie Lassa, a young mother of two and state Senator. This race represents a changing of the guard more than most; Obey was in Congress before either Lassa or Duffy was born.
In Rhode Island, the race for Governor will be interesting in November. John Robitaille, a staffer for the current Republican governor, got his party's nomination. He'll face off against the State Treasurer, Frank Caprio, in November. But also on the ballot will be former Republican Sen. Lincoln Chaffee, now an Independent. Chaffee left the Republican party after losing his Senate reelection campaign in 2006. And he has lamented the dearth of moderate Republicans. He is running as someone who will unabashedly seek to raise taxes to balance the budget.
Several Democrats who faced primary challenges were able to brush their opponents away.
Democratic Rep. Stephen Lynch in liberal Massachusetts drew the ire of Democrats for opposing the health care law. But he easily brushed aside a primary challenge from Mac D'Alessandro, a union activist.
Rep. Barney Frank easily defeated a woman who decided to run against him after the two got into a verbal argument at a townhall meeting.