In Arkansas, centrist Democratic Senator Blanche Lincoln failed to win a majority of votes in the primary against a left-leaning challenger, and is headed to a June run-off for her party's nomination.
VOA: standard.2010.05.19
The opposition challenger, Victor Yushchenko, won the re-run of Ukraine's presidential election.
Yet he remains the overwhelming favourite to keep his job after the presidential election due in October, largely because no real challenger could run freely against him.
Mr Karzai was declared Afghan president after a second round election run-off was abandoned when his sole remaining challenger pulled out, saying the vote could not be free and fair.