Maine Republican Sen. Susan Collins is urging GOP presidential contender John McCain to stop making automated calls into her state that link Democratic nominee Barack Obama to a 1960s radical. Collins spokesman Kevin Kelley says such tactics have no place in Maine politics and Collins wants the McCain campaign to stop these calls immediately. McCain traveled to North Carolina in advance of a rally today. His campaign did not immediately respond to a request for comment. Collins is being challenged for re-election by Democratic Rep. Tom Allen. She also serves as a co-chairwoman of McCain’s Maine campaign committee. The so-called robo calls refer to Obama’s ties to one-time Weather Underground leader William Ayers. They’re being made not only in Maine, but also Nevada, Wisconsin and other targeted states.