So what was the wrong he has issues with?
I was looking for a Facebook profile to see his interests and likes to get an idea where he stands on the issues. No luck yet.
Wicker was in one group of Republicans who voted for a cloture vote (an early gun control vote) that most Republicans and conservatives opposed. And certainly the Dims who got the letters would have voted for cloture.
The envelopes were mailed before that vote, but the Wicker might have stated his intentions beforehand. That's a vote from Wicker that surprised some.
Then again, that might not be related.