It's rare when two incumbents go down to defeat on the same night in a primary as well. And it's just as rare that a member of each party loses a seat on the same primary night. (The Associated Press says it last happened in Maryland in the 1970 primary.)

But last night voter anger boiled over in Maryland, as veteran Congressman Al Wynn (D-MD)and Congressman Wayne Gilchrest (R-MD) were defeated in their respective primary races.

After eight terms in office, Wynn was seen as not liberal enough by some activists in his black majority district. He had already angered voters so much, that he almost lost two years ago to Democrat Donna Edwards. Both candidates are black, as Edwards now becomes the favorite to win election in November..

On the GOP side, the issue was Iraq, as voters turned against Rep. Gilchrest over his opposition to the Iraq war. He initially supported the war, but then turned against it last year, one of only a handful of Republicans in the Congress to do so.

The leader in his primary was Md. State Senator Andy Harris, who emphasized his conservative leanings. Rep. Gilchrest barely got a third of the vote in a six candidate race.

So we have two incumbents from the U.S. House losing their seats in Maryland, both to challengers who were further out on the flanks of their respective parties.

That tells me that other lawmakers running for re-election this year in Congress better run scared.

That also tells me that talk about bi-partisan cooperation, as usual, is just talk. For the most part, the voters don't want to elect someone who is going to work with the other party, they want their party to win.

Maryland is a closed primary state, so no independents could vote in those races.