Sen. Arlen Specter isn’t inconsistent — he merely follows the political winds, no matter how they’re blowing.

His latest shift: He now wants to help labor bosses start more unions.

As a liberal Republican in 2007, Specter backed the Employee Free Choice Act, a cynically named bill labor was pushing because it would ban secret ballots, making it harder for coerced workers to resist organizing drives.

Then, feeling heat from the right — in the form of a primary challenge — Specter decided it best to oppose the bill, and quickly flip-flopped.

But then the winds shifted yet again: Having switched parties, Specter’s now facing a challenge from his left — from Democratic Rep. Joseph Sestak.

But, hey — no problem for Specter. He’s now back to pandering to the left — to the very same labor bosses, in fact, whom he once betrayed on the “Free Choice” bill.

This time, Specter wouldn’t ban secret ballots, but only require fast-track elections: If even a small group of workers petitions to unionize, an election would have to be scheduled within a week.

Labor bosses believe the short timetable would let them quickly ram through more votes in favor of organizing. Never mind any debate — or even thoughtful consideration of the issue.

For Specter, it’s the politics that count. If you want to know where he’ll be on the issue next week, check with the weatherman.