In the last month, Workhorse Group (NASDAQ:WKHS) had trouble breaking out to new highs. Markets are waiting for the company to finalize a deal with US Postal Service by the end of the year. If it happens, it may win more customers for its electric delivery vehicles. WKHS stock is a high risk, high reward investment. Source: Photo from WorkHorse.com The electric vehicle sector is still very hot. Tesla (NASDAQ:TSLA) led it higher and increased investor interest after its battery day. So, what will it take for Workhorse to keep rising?