In 1988, a presidential election year, Democrats joined a unanimous vote to confirm Reagan appointee Anthony Kennedy to the Supreme Court.
In 2015, more than a year before a presidential election, Republicans unanimously vowed to refuse considering any Obama SC appointee at all.
In 2006, Republican Mitt Romney shepherded a universal health care bill through the Democratic Massachusetts legislature. In 2008, Republicans unanimously vowed to block any Democratic ideas on health-care reform.
In 2009, Sen. John McCain explained the utter lack of GOP support for Obama's stimulus package was largely due to its conflict with balancing the budget. In 2017, he supported a GOP stimulus/tax relief plan that would substantially increase the federal deficit.
I suspect you'll find any leftward trend on this forum to be accentuated by (what seems to me) a decline in the level of discourse by conservative members of this forum, some of whom have rejected evidence-base argument completely in favor of potshots, innuendo and extreme tribalism.
Even McCain was despised as a RINO, because he did not quite fall into line on repealing the ACA, which the Republicans had done nothing to replace despite vowing to do so for 7 years, not helped by the 2010 teabag wave that further vilified (if possible) the Democratic Party. Despite his later annoyance with the Tea Party, McCain largely enabled it, stating the GOP wasn't the part of "no" - it was the party of "hell no." Though I respected McCain a lot, he was mainly just as obstructionist as the rest of his party.
Maybe it's a chicken-egg thing, but it seems to me if "conservatives" on the forum abandoned all pretense of critical thinking, there is not much call to cite conservative intellectuals, who, naturally, are vilified as RINOS.
YMMV.