[Diogenesis]

"Stabler, who backs Romney, declined to speculate
on why Gingrich is remaining in the race."

How about:

[Cincinatus' Wife]

Newt Gingrich is seeking pledge delegates and unpledged delegates - delegates that haven't committed in primaries - including upcoming PA (72), and already completed MT (26) and IL (69) delegates, since these delegates remain unpledged regardless of primary vote.

AND though there are going to be some “winner take all” primaries, the following contests are also on the schedule:

RI (16) proportional
NY (92) proportional
WVA (28) proportional -- elect delegates (who list their presidential pick on ballot)
NC (52) proportional
OR (25) proportional
AK (33) proportional
KY (42) proportional
TX (155) proportional
CA (169) proportional (by district)
NM (20) proportional
SD (25) proportional

The Green Papers

There there are the Contested delegates: …. “delegates have to be "uncontested" in order to count. The frontrunner's rivals argue some of the states that awarded Romney all of their delegates violated Republican National Committee rules when they moved their contests ahead of April 1 and therefore should distribute delegates proportionally. This dispute, if it continues, would not be ruled on until the August convention in Tampa.

"All the media counts right now give him all of Florida, which is against the rules, all of Arizona, which is against the rules, and all of Idaho," Gingrich said Monday. "Those are all three proportional states and they should only be counting his share. So he has to win 1,144 uncontested delegates."

FL: 50 delegates
ID: 32 delegates
AZ: 29 delegates