2018 Vote The Blue Wave - Midterm Election T-Shirt. Are you or someone you know planning to vote at the mid-term elections? Support Democrat and the blue wave with this shirt. This cool design features a ballot box and voting slip forming a blue wave. , 2018 Vote The Blue Wave - Midterm Election T-Shirt. This blue wave 2018 t shirt is a great election day shirt. The blue wave is coming so get your Democratic shirt ready for the midterm elections in November. Make this your 2018 election vote shirt!