Zell Miller in History

[Orwell]

I guess his 2004 RNC speech hammering Kerry on national defense clearly helped Bush in winning 11 % of registered Democrats in 2004.

https://en.wikipedia.org/wiki/2004_United_States_presidential_election#Voter_demographics

Bush won 11% of Democrats in 2000, Dole got 23% of Conservative Dems, 10% of Moderate Dems, and 5% of Liberal Dems. Bush 41 in 1992 got 11% of Liberal Dems, 9% of Moderate Dems, and 23% of Conservative Dems. 41 in 1988 got 17% of Dems.

Hell McCain got 10% of Dems, It's more likely that it wasn't a national security thing that brought over disaffected Dems, but registered Dem voters who eventually died or registered with the GOP.