David Cameron was interrupted by a heckler as he gave an answer during the leaders' debate.
The woman stood up and said she "had to speak out" over homeless ex-servicemen.
The Prime Minister attempted to finish his answer, amid continued shouting from the audience member.
The heckler was later removed from the studio.
ITV News Political Editor Tom Brady said Mr Cameron had handled the unexpected interruption "reasonably well".
Last night there wasn't one particular knockout blow but the political landscape in Britain does seem to be shifting.
Another day on the election trail and the campaign catchphrase is starting to bite.
Leaders' Debate shows was how our political horizon has suddenly changed as smaller parties did all they could to make themselves heard.