Conroy said he hopes to lead by example in Washington in an effort to "stop the bickering."
He is part of an already crowded Democratic field that includes Newton Mayor Seti Warren, nonprofit AmeriCorps organization City Year founder Alan Khazei, lawyers Marisa DeFranco and James Coyne King, businessman Bob Massie and engineer Herb Robinson.
Conroy said he has more experience than all of them. He also questioned Brown's voting record since the Wrentham Republican took office in February 2010.
Conroy said Brown has voted along the Republican party line 90 percent of the time.
"That's not reflective of what most people want," said Conroy. "I don't think he's gotten much accomplished. That's not what people want. He's not a leader."
Conroy's trip across the state concludes Sept. 3 on Boston Common.
Conroy is sure to mark each end point on his walks before heading home or driving to appearances, so he can return to the same spot and pick up where he left off.
"I'm walking point to point," said Conroy. "This whole thing is contiguous."
Conroy estimates he's already travelled over 500 miles — averaging six or seven miles per day — and has spoken to several thousand people in over 100 cities and towns.
"I want to carry their voices down to Washington," he said.
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