She's hopping on the bandwagon. IF she could be part of a successful stoppage she'd vote no in a flash.
I expect this is the case too. She's not a Senator that anyone describe as "courageous".
I think bandwagon is part of it, but if she had gone against Alito, then it would have seriously undercut her fellow REPUBLICAN senator in Maine, Susan Collins.
Apparently, the political winds in Maine make it necessary for repubs to be a bit more liberal.
Snowe would have been sending the message that she is righteous but that Collins is unrighteous.
You got that right.