You can repeat the word radical a hundred times, it just doesn't make it so, and all available empirical evidence seems to be completely against it. Was healthcare radically overhauled? Um, no, he didn't even fight for single payer. Did he recall all troops overseas? Um, no, he launched a couple extra wars for good measure and upped drone attacks. Did he declare peace with all muslim extremists? Um, no, see above, and also see the indefinite detention guidelines he's upholding. Did he push for gay marriage? Um, no, he very slowly pushed congress to repeal DADT and is working towards the same with DOMA but refused the easy way out of an Executive Order which many liberals argued for. Did he grant amnesty to illegal aliens? Um, no, he hasn't even proposed any immigration legislation yet. Radicalism not found, this guy basically governs from the center (barely left) and is frequently scarily pragmatic.