What do you mean by support? Whoever gets elected, I doubt the Jones Act is going anywhere. First off, executive branch does not make laws. The "woman" appears to support Jones Act, but she was just giving a speech at a union.
What hurt domestic shipping greatly is that there just isn't much to ship domestically these days compared to the past. Instead of making stuff in the USA and shipping it around (raw materials to finished goods), it's all made overseas and shipped here completed. Also, trucking took over a lot--annoyingly. Railroads have downsized a bunch in the last 50 years, but they also became more efficient and reliable.