The First Lady will visit Boston today, as she continues to travel to promote the president’s record and drum up money for his reelection campaign. Obama touches down in Boston on Friday afternoon for a reception and $5,000- to $25,000-a-head dinner at the Institute of Contemporary Art to benefit the Obama Victory Fund. She will give a speech, mingle, pose for pictures. It will be her fourth campaign event in the past week, squeezed between her official duties. Earlier in the day she will visit Concord, N.H., to promote her national initiative to fight childhood obesity.