The uniter (Allison Shelley/Getty Images)

It turns out there is something everyone in Washington can agree on: They all love Patrick Duffy.

The “Dallas” star was the toast of the town when he came to D.C. last weekend to attend the White House Correspondents’ Association Dinner — a.k.a. the “nerd prom,” an annual schmooze-fest that brings together Beltway insiders and Hollywood elite to celebrate journalism. Think of it as Washington’s version of the Oil Baron’s Ball, but without the food fights.

Throughout the weekend, social media buzzed with pics of muckety-mucks posing with Duffy, including MSNBC anchor Thomas Roberts, who ran into the actor at a pre-dinner shindig and tweeted, “This weekend is gonna rock when the first person I meet is ‘Bobby Ewing.’” Later, CNN reporter Elise Labott tweeted a selfie with Duffy, along with her observation that “[h]e’s still so handsome.”

Duffy also got a shout…