Chancellor Angela Merkel's conservatives strengthened their position as the largest party in the western state of Saarland in a regional vote on Sunday, bolstering her prospects of winning a fourth term in September's national election, Reuters reported. The election was the first of three regional votes ahead of the Sept. 24 federal vote and as such offered an opportunity for the parties to build -- or lose -- momentum in their quest to prevail at the national level. Merkel's Christian Democrats (CDU) won 41 percent of the vote, up from 35.2 percent in the last election in Saarland in 2012, an exit poll for broadcaster ARD showed. The Social Democrats (SPD) won 29.5 percent, down from 30.6 percent. The dip in support for the SPD was a setback in its first electoral test under new leader Martin Schulz. He has re-energised the centre-left party with a promise to tackle inequality that is resonating with many voters nationally. Like federal Germany, Saarland has been governed by a 'grand coalition' of Merkel's conservatives and the SPD and that situation looked likely to continue as the result left the CDU short of sufficient support to rule alone in the state. The SPD and the far-left Linke, which won 13 percent, also lacked enough votes to form a left-leaning coalition in the state assembly.