“Money is the mother’s milk of politics,” said Democratic consultant Michael Shea, who worked for U.S. Rep. Michael Capuano in his failed bid for U.S. Senate earlier this year. “A lot of people would like to undo the Scott Brown effect and show that it’s over now — but money is always a factor.”…

Capuano has only $91,000 on hand and Lynch has $755,000, according to Federal Election Committee filings. Brown, meanwhile, has $6.77 million.

“Scott Brown is still the most popular politician in the state today. He has a national fund-raising base, which has only grown stronger over time,” said Republican consultant Ron Kaufman.

But other potential challengers, such as U.S. Rep. Edward Markey (D-Malden) and former congressman Martin T. Meehan, have stronger accounts. Markey has $3.3 million on hand and Meehan has $4.5 million.