It’s only one month, and there will be plenty of twists and turns between now and November 2012, but I can’t help but notice that the month of May has been awfully kind to the Democratic Party.

Last night, in a major upset, Buffalo-area voters elected a Democratic congresswoman in a ruby-red district that never elects Democrats. The driving issue of the campaign: the Republican agenda in Congress.

That’s the highest-profile win for the party, but it’s also the latest in a line of recent victories.

* New Hampshire: Last week, there was a special election in a state House district where Republicans have dominated for years. The Democratic candidate won in a landslide, even after a local town clerk illegally required photo IDs to vote.

* Florida: Also last week, Jacksonville was home to a high-profile mayoral race, and the state GOP touted the election as the first warning shot of the 2012 cycle. Instead, voters elected Democrat Alvin Brown — Jacksonville’s first African-American mayor — stunning the Republican establishment statewide.

* Wisconsin: Three weeks ago, there was a special election in a Wisconsin state Assembly district that has been represented by a Republican for 16 years. In this case, the Democrat won by eight points.

* Maine: Two weeks ago, there was a special election to fill a vacancy in the state Senate, in a district that has been very competitive in the recent past. In this case, the Democrat won by a crushing 2-to-1 margin.

This is not to say that Dems are back on track after a brutal 2010. Indeed, Democrats did quite well in 2009 special elections, only to receive a “shellacking” a year later.

But Republicans started 2011 thinking the wind was at their backs, and it was the GOP with all the national momentum. After a series of losses in races Republicans expected to win with relative ease, the party would be wise to take a moment to realize Americans aren’t buying what the GOP is selling.

Indeed, it looks an awful lot like buyer’s remorse is the most common public sentiment.

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.