may have been persuaded by the House Spkr at the time to
switch his vote. Maybe a promise of a plum job or
some other perk?
How about Cheryl Jacques “rhymes with fakes”, who
had pledged to fight back against the likes of
Billy Bulger but lated became a Bulger bumkisser?
It can happen.
http://en.wikipedia.org/wiki/Cheryl_Jacques
Actually, Slattery took a lot of heat for flipping at the last moment and I think that grief was from the Speaker at the time.