Can the PPP force a runoff in the upcoming election?

In the last couple of days I have been talking to former students about the upcoming Ghanaian elections to try and get a feel for what will happen in December. If a candidate does not get 51% of the vote in the first round then there is a runoff election. The two main players are the NDC (National Democratic Congress) and the NPP (New Patriotic Party), but the PPP (Progressive Peoples' Party) candidate  probably has enough support to prevent either party from getting 51% in the first round. That means the NPP probably has a better chance of unseating the NDC from the presidency than I previously thought.