why doesn't Obama just run as a repug in 2012 and let us elect a real Democrat?

Obama halts controversial EPA regulation

WASHINGTON (AP) — President Barack Obama on Friday scrapped his administration's controversial plans to tighten smog rules, bowing to the demands of congressional Republicans and some business leaders.

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He does any and everything the repugs want as it is - why doesn't he just call himself one so we can get someone who will act like a Democrat in the White House.
This really is sickening.