So says WaPo's Chris Cillizza, who makesa convincing case that most everything appears to be going right for Republicans, while everything is going badly for the Democrats.

The decision by Sen. John Walsh (D-Mont.) not to seek election in November in the wake of a plagiarism scandal is the latest piece of good news for Republicans as they strive to take control of the Senate in less than three months.

Walsh’s departure from the race came in the same week that two Republican senators — Pat Roberts in Kansas and Lamar Alexander in Tennessee — defeated tea party challengers in primary fights, ensuring that every GOP senator seeking reelection would be the party’s nominee.

These past seven days typified the fates of the two parties this election cycle. Democrats have been hit by retirements in tough states — Montana, West Virginia, South Dakota and, to a lesser extent, Iowa — and Republicans haven’t nominated the sort of extreme candidates who lack broader appeal in a general election.

Those realities — along with a national playing field in which a handful of incumbent Democrats are defending Republican-leaning seats in places where President Obama is deeply unpopular — have made a GOP takeover a better-than-50/50 proposition.

Let’s go through the races.

Walsh’s decision not to run takes what was an uphill climb for Democrats and turns it into something close to a no-chance race. (A committee of Democrats will pick the party’s nominee by Aug. 20.) Montana joins the contests for open seats in West Virginia and South Dakota in that category, meaning that, unless something drastically changes, Republicans should have three takeovers in the bank — a nice head start going into Election Day.

That means the party needs three more pickups to gain the Senate majority. And it has more than enough seats in play to do it. Democratic-held seats in Alaska, Arkansas, Colorado, Iowa, Louisiana and North Carolina are competitive at this point. (Races in Michigan, New Hampshire and Oregon seem to be moving in the Democrats’ direction.)

Of that group, the seats in Louisiana and Arkansas seem to be the most endangered for Democrats, in large part because of the strongly Republican nature of both states.

Moreover, the two states where the GOP is playing defense - Kentucky and Georgia - haven't given the Democrats much hope. Kentucky appears the most winnable for the Dems. but their candidate - Allison Lundergan Grimes - is stumbling over the "war on coal" issue. McConnell may just squeak by.

Georgia Republicans have coalexced around their nominee David Perdue and despite Michelle Nunn's name recognition (her father was a long serving Senator, Sam Nunn), the natural equolobrium is reasserting itself in this very conservative state.