THE OTHER RACE IN DELAWARE…. There’s been considerable interest in Delaware’s Republican Senate primary this week, and with good reason — it’s not often a key Republican pick-up opportunity becomes a Democratic opportunity overnight.

But reader R.S. emails a good question:

I am out here [location redacted], so I don’t know much about Delaware, but I do know Castle was their member of the House of Representatives.

All the focus has been on the Senate race. Who is running to replace Castle in the House? Democratic pickup in the offing?

It’s an interesting story, actually. In the open U.S. House race, with Mike Castle (R) giving up his seat for an unsuccessful Senate race, the Republican Party rallied behind a candidate named Michelle Rollins, a wealthy attorney named to the NRCC’s “Young Guns” program and the beneficiary of campaign checks from every member of the House Republican leadership. Democrats, meanwhile, rallied to former Lt. Gov. John Carney (D), setting up a competitive contest.

But the same GOP primary voters who nominated Christine O’Donnell for the U.S. Senate weren’t impressed with the establishment’s choice for the House, and they nominated real estate developer and Tea Party favorite Glen Urquhart.

There aren’t many “red” House seats Dems hope to flip this year, but this is clearly one of them. A survey this week from Public Policy Polling showed Carney leading Urquhart by double digits, 48% to 37%

Soon after the NRCC announced its list of 47 races in which it plans to air television ads — and Urquhart’s didn’t make the list.

And just to get a sense of what kind of congressional candidate Glen Urquhart is, note that he believes the notion of separation of church and state was crafted, not by Thomas Jefferson and James Madison, but by Adolf Hitler. He recently told voters, “[The] next time your liberal friends talk about the separation of church and state, ask them why they’re Nazis.”

Seriously. He actually said that.

PPP’s Dean Debnam noted this week, “Delaware has really worked out well for Democrats.”

Steve Benen

Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.