On one level, Maine’s lone Republican in Congress, Sen. Susan Collins, looks like a defeat waiting to happen. She is a Republican from a state that went comfortably for Democrat Barack Obama twice. And she is from New England, a part of the country where the GOP is all but extinct in federal office. Collins almost appears to be a Republican version of Arkansas Sen. Mark Pryor, a moderate Democrat who is vulnerable next year because his party label, which once was an asset back home, has become a liability as his state’s politics has changed. But while Collins’ profile suggests vulnerability as she mounts another bid for re-election, there are no signs of a serious challenge on the horizon. In fact, veteran Democratic insiders scoff at the idea that the moderate Republican will even have to break a sweat in her sprint to a fourth term. A Public Policy Polling (a Democratic firm) survey in January showed Collins with a 65 percent job approval rating and holding leads of 18 points and 25 points over the state’s two Democratic House members. (more…)