[BroJoeK]

DoodleDawg: "James Wallace was a Maryland Republican"

First of all:

We should note in post #675 above where HandyDandy says to FLT-bird, "You are practiced in the Lost Causer art of deception."
Take it as a working hypothesis that virtually everything posted by Lost Causers is in some way deceptive -- after all, if it were true, why bother posting it?
Remember, these people are all Democrats and the function of Democrats in life is to lie their way into political power.
So, first & foremost, don't believe them.

In this case your Marylander, James Wallace, may or may not have been a slave-holder, I've seen no evidence either way.
But he certainly was not a Republican, like most Marylanders of that time, Wallace was an "American" aka, Know-nothing.
Yes, he served in the Union army, fought at Gettysburg, as did many Northern Democrats & other parties.
Whether Wallace voted for Lincoln over McClellan in 1864, we don't know, but we might notice that Lincoln himself ran not as a Republican, but under the National Union party in order to attract votes from just such people as Maryland's James Wallace.

DoodleDawg: "George Fisher was the second largest slave owner in Delaware and was also a Republican congressman during the Lincoln Administration."

Some sources claim George Fisher was "the second largest slave owner in Delaware" but the New York Times did not.
And the George P. Fisher elected to the US House of Representatives in 1860 was a Wilmington lawyer and Unionist or "People's Party", not Republican.
In Congress Fisher supported Lincoln's compensated emancipation proposal, but the Delaware legislature rejected it, by one vote.

DoodleDawg: "Benjamin Burton, the largest Delaware slave owner was a prominent local Republican."

Benjamin Burton holding 28 slaves is said to have been Delaware's largest slave-holder, and was friendly to Lincoln's proposal for compensated emancipation.
Some sources do identify him as a Republican, but the New York Times article mentioning him does not.
In 1860 Delaware split its votes among all four political parties, with the most votes going to Southern Democrat Breckinridge.
So it seems most likely that Breckinridge or Unionist John Bell would be the choice of Delaware's very few slave-holders.

By the way, our Lost Causers have raised a fuss about Lincoln's supposed support for the proposed Corwin Amendment, but what Lincoln truly did support at that time was his own proposal for compensated emancipation in Union slave states.

DoodleDawg: "D'Souza's claim is BS."

I'd say we have to allow for some ambiguity in who, exactly, qualified as Republicans at that time, especially in Border States like Maryland & Delaware.
Lincoln himself tried to win votes from such non-Republicans by running under the National Union party banner in 1864.

[x]

I haven't been able to find anything out about Benjamin Burton, but many people in the Border States were caught between the two parties and didn't really fit into either of them. George Fisher, the Delaware Congressman associated with Benjamin Burton was a Unionist elected on a "People's Party" platform. I suspect there were a lot of left-over Whigs and Know-Nothings who didn't want to support the Democrats but weren't wholly committed to the Republicans.

Francis Preston Blair was a slaveowner from Kentucky who came to oppose the expansion of slavery and left the Democrats for the Free Soilers and then the Republicans. His son Montgomery Blair was in Lincoln's cabinet and his other son Francis Jr. went back and forth from Republican to Democrat. One of the Blairs was involved with one of Sumter Commander Robert Anderson's children (married or not is unclear), and that's where the actor Montgomery Clift came from.