It’s not just Republicans who are fed up with Connecticut Sen. Christopher J. Dodd, some state Democrats have also begun expressing their displeasure with the five-term incumbent.

One Democrat, Stamford attorney Roger Pearson, is now even mulling a challenge to his own party’s senator, Hartford Courant columnist Kevin Rennie reported Friday.

According to Rennie, Pearson “has formed a committee to explore a run for his party’s 2010 nomination,” saying he has become “disaffected” with Dodd.

It’s unlikely Dodd will lose sleep over a challenge from Pearson,who served as Greenwich, Conn. first selectman between 1977 and 1987, but there is one Democrat that could create a serious stumbling block — popular Connecticut Attorney General Richard Blumenthal.

Local Democrats have grown unseasy as Dodd’s poll numbers have sunk in recent months, and there are have been rumblings among the party faithful that it may be better to nominate someone like Blumenthal, who is more likely to hold the seat. But the attorney general told the Courant Thursday that while he would like to run for the Senate, he would not challenge Dodd.