Short interest in the "Trump ETF," iShares MSCI Mexico Capped ETF (EWW), has risen to nearly 75% of fund's outstanding float (S3 Partners LLC)Shorts have increased 105% YTD, to $745 mln; total fund size is $1.15 bln (S3 Partners)Real Clear Politics national poll average has Democratic candidate Hillary Clinton with a narrowing, 1.7% advantage over Republican candidate Donald TrumpEWW seen as weather vane for Trump's chances of winning the U.S. presidential election in Nov, as Mexico has been a prime target of his proposals.imho, "political" plays are very risky, they are completely unpredictable.