Two attempts to line up the contenders for the Republican nomination for US President in 2012 attempt to identify where another candidate could step in and fill a current vacancy. (Hat tip: ilovecharts.tumblr.com)
The first, from the NYTimes, aligns candidates by relative moderate/conservative and insider/outsider, though any such distinctions are going to be more relative than absolute measures. Your mileage may vary. The size of the bubble depicts Intrade's probability of that person getting the nomination. Colors represent geographic interests. Clearly there is a lot of room for mildly-moderate outsiders and extremely-conservative insiders.
The second, from the not-particularly-conservative-friendly New Republic, notes that we have a decided lack of sane non-Mormons and insane Mormons potentially running.