Except that he is.
He ran as a Republican for Governor, and was elected.
In 1983 he formed the Conservative Opportunity Society (COS), a group that included young conservative House Republicans.
In 1989 he became the House Minority Whip, his first position of leadership with the Republican Party.
He rallied with the Gang of Seven against what they saw as ethical decline in the Democratic Party.
In the 1994 campaign season, in an effort to offer an alternative to Democratic policies and to unite distant wings of the Republican Party, Gingrich and several other Republicans came up with a Contract with America, which laid out ten policies that Republicans promised to bring to a vote on the House floor during the first hundred days of the new Congress, if they won the election.
Following Gingrich's first two years as House Speaker, the Republican majority was re-elected in the 1996 election, the first time Republicans had done so in 68 years, and the first time simultaneously with a Democratic president winning re-election.
He fought against reforms the Clinton administration pushed to get through, in order to maintain the Republican agenda.
He helped to pressed through the Congressional Accountability Act, a shining jewel in the Republican legislation history.
You know, I could go on, but there is no point. Please, let me remind you of something:
Just because you don't like him, you can't state "He is not a Republican or Conservative" as though it is fact. It doesn't work like that.
Now, as I'll get either no response from you, or you'll quote only a tiny bit of this and respond with a three word answer, Whatever. You're the asshat of the year for a reason.