WARSAW - Tens of thousands of protesters marched through the Polish capital on Saturday, the start of an opposition drive to capitalize on the spluttering economy and try to loosen Prime Minister Donald Tusk's grip on power.

Poland's economy, the biggest in central Europe, has grown robustly even while its neighbors slipped into recession, handing Tusk high levels of support and leaving his opponents struggling to win credibility with voters.

Economic growth is expected to slow to just above 2 percent next year. That is healthy by the standards of most European countries but a jarring deceleration for Poles used to two decades of uninterrupted growth.

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