The term would be consensus. As, in the two parties have reached an agreement somewhere in between each party's original platform on a specific subject. This is why it is cooperation, that is, the parties have reached a middle ground for the common good; not that one party has "gone over" to the beliefs & ideas (platform) of the other party.
In politics, the word consensus, originates in parliamentary law/procedure, also called legislative procedure, legislative order, rules of order. That is, the rules, customs, and ethics that govern meetings of legislative bodies, like the U.S. Congress, the UK's Parliament, etc.,.
[For more on parliamentary procedure in the US House and Senate, search on "Roberts Rules of Order" or "Rules of Order US Congress"]
Consensus is used differently in other disciplines. For the political meaning of consensus, the first two sentences of the introductory/summary paragraph on the Wikipedia page for "Consensus decision making" clearly defines how this word is used when describing the cooperation of, but not (necessarily) agreement between democrats and republicans:
"Consensus decision-making is a group decision making process that seeks the consent, not necessarily the agreement of participants and the resolution of objections. Consensus is defined by Merriam-Webster as, first, general agreement, and second, group solidarity of belief or sentiment."
restoring the power of the democrats and white supremacy
Democrats are not voting on mid term elections because they are unhappy
Democrats = Known as Liberals. Republicans = Known as Conservatives.
A term used for Northern Democrats.
7
southern democrats' term for their return to power in the south in the 1870s
The Democrats lost seven seats in the 2014 mid-term elections to lose control of the US senate
The term used to describe the right to vote is suffrage.
The term used to describe a moving object is "kinetic."
The term to describe a material's ability to be drawn out into a thin wire is ductility.
The term used to describe a group of tortoises is "a creep."
The term Dixiecrats refers to members of the Democrat party from the South who are conservative in politics. This term has been replace mainly by the term Blue Dog Democrats.