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Per Chuck Todd,

Assuming Clinton and Obama split the remaining 86 delegates at stake in Puerto Rico, South Dakota and Montana evenly (43 apiece), that would put Sen. Obama 19.5 away from clinching the nomination. (So, for all practical purposes, he would need about 20 superdelegates to hit the magic number.) Clinton would need 195.

(There are about 210 superdelegates left.)