Nice thought, but absolutely unconstitutional. Pres and VP must be citizens of (read: reside in) different states. Remember, the 'Rats tried this shtick on Cheney in '00 -- claimed he was a Texan like Bush. Fortunately, he had little or no difficulty in demonstrating he was a Wyomian (Wyomingite? Anyway, a person from Wyoming...).
Which would mean that Lynn Cheney would have no problem proving she was a Texan, but it's not going to happen.
Ooops, you're right.....oh, well......how Cheney and Rice? Lynn Cheney and Condi Rice?
It's not un-Constitutional, just unwise. The Constitution says that a Presidential Elector must vote for one Presidential and one Vice-Presidential candidate who is not a citizen of the same State as the elector, or that vote will not be counted. The practical effect is to force Electors to vote for a 'ticket' which has a President and Vice-Presidential candidate from different States.
If an Elector tried voting for a Presidential/Vice-Presidential same-State ticket which was the Elector's State, then most probably they would choose not to vote for the Vice-Presidential candidate so that their Presidential vote would still count. The bottom line is that the Vice-Presidential candidate of a same-State ticket would loose the electoral votes of his home State.
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