The Muslim Brotherhood candidate wouldn't stand for that, which is why they'd probably just coup him outright.
The Muslim Brotherhood is a cautious organization that knows the power of the army, and the power of the United States, very well. They would consider such a state of affairs a major improvement over the past state of affairs and a base to work from.
What you need to wonder though is, just how much did the Muslim Brotherhood benefit electorally, not just from being the only established political group with any sort of credibility whatsoever when Mubarak fell, but also from having supported the Tahrir protests from fairly early on but not having co-instigated them in any way or form - in short, from the votes of frightened people who wanted law and order back and would never have toppled Mubarak - from the votes of ordinary Middle Class (western usage) people, in short? 'Cause these people are going to vote for Moussa.
