Campaigning in ambiguous presidential race starts in Ukraine

A presidential election campaign has officially begun in Ukraine, a tough challenge for the incumbent

A poll of 2,017 eligible voters published last week put Poroshenko's approval rating at just over 14 percent. Another likely candidate, former Prime Minister Yulia Tymoshenko, had support from 16 percent of those surveyed.

Other presidential hopefuls trailed behind the two. The Razumkov Center poll had a margin of error of 2.3 percentage points.