IT WAS ONLY a matter of time until the mischief of those Prince George's supporters of TRIM would come back to haunt them--and it's already on the return route from Annapolis, with no warm wishes. It began with the vote in which Parris Glendening, who campaigned hard for a modification of the TRIM property tax ceiling, was elected but strapped by a simultaneous vote to keep TRIM as is. The result was to send Mr. Glending on Mission Improbable to Annapolis, to seek state funds to make up for county shortages caused by TRIM.

There, members of the county's delegation have fallen into two camps: those who aren't amused and those who seem to enjoy watching Mr. Glendening squirm and scramble for state aid. Each time Mr. Glendening proposes a way that the legislature might help the county's revenue picture, the lawmakers feign surprise, claim he never consulted with them, cast doubt on his budget figures and point him somewhere else.

State politicians are always sticklers for courtesy calls and stroking, but for the members of the Prince George's delegation to be rolling their eyes upward and claiming that Mr. Glendening's failure to consult them is cause for ignoring the county's financial plight is a dodge. Mr. Glendening's requests for adjustments in the state income and personal property tax rates should be addressed forthrightly in Annapolis. If the county's representatives to the state legislature are unwilling to bail out the voters who wouldn't lift TRIM, they should say so and let the county face the consequences. But if they care enough to help, they should get on with tax relief measures as well as pledges to work for the modification of TRIM at the earliest possible date.