Galloway later boarded a bus for a celebratory tour of his constituency and Bradford city centre.
Puffing on a cigar, he made victory signs on the top deck amid the crowd's cheers.
Referring to his stint on TV reality show Big Brother, one supporter said: "The pussy cat was the disguise of a lion."
More top news
New Psychoactive Substances Bill creates a blanket ban on the sale of legal highs, with up to 7 years in jail for selling them.
Pharmaceutical giant Roche is trialling a new type of treatment which could work better than chemotherapy.
Old Labour firebrand Derek Hatton is now locked in a new fight - to rejoin his old party.